Molecular Formula: C36H3815N4O8 Molecular Weight (g/mol): 658.68 Synonym: 3,8,13,18-Tetramethyl-21H,23H-porphine-2,7,12,17-tetrapropanoic -15N4 Acid,3,8,13,18-Tetramethyl-21H,23H-porphine-2,7,12,17-tetrapropionic-15N4 Acid,NSC 267073-15N4 IUPAC Name: 3-[7,12,17-tris(2-carboxyethyl)-3,8,13,18-tetramethyl-21,22-dihydroporphyrin-2-yl]propanoic acid SMILES: CC(C(/C=C(C(CCC(O)=O)=C/1C)\[15NH]C1=C/2)=[15N]/3)=C(CCC(O)=O)C3=C\C4=C(C)C(CCC(O)=O)=C(/C=C5C(C)=C(CCC(O)=O)C2=[15N]/5)[15NH]4